greenwood



'W. H. GREENWOOD.

No.v 29,588. Patented Aug. 144, 1860.

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IVM. H. GREEN\VOOD, OF GLVA, ILLINOIS.

LOCK.

Specification of Letters Patent No. 29,588, dated August 14, 1860. n

To all whom it may concern.'

Beit known that I, IVM. H. GREENWOOD, of Galva, in the county of Henry, and State of Illinois, have invented a new and Improved Lock for Doors and Other Purposes; and I do hereby declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in combining a rack and pinion guard in such a manner that when the lock is locked to any number indicated by the key (or reinembered if the number has been changed) it can be unlocked to no other number that the key can be set at, the key in this specification having a combination of Iall of the numbers from 0, to 999999, inclusive, making one million.

Figure 1 is a view of the lock, as seen from the inside of the door, it being unlocked and the cap taken off, so that the inside can be seen. Fig. 2 is the same View of the lock when locked, with the cross-piece H taken off, and the main bolt, A, dotted in, so as to show the position of the stop-bolt B. Fig. 3 is a vert-ical sect-ion lengthwise through the center of the handle G, the lock being unlocked. Fig. 4, is the same section as Fig. 3, it being locked and the key rema-ining in.

Fig. 5 is the stop-bolt in detail, B, being a front, and B, an edge View of it; b bein@ a notch into which a part of the main bolt a.) goes, when the lock is unlocked; and z', the place where the flange of the handle G turns to throw the bolt up and down.

Fig. 6 is the frame, which holds the racks, in det-ail, E being a front, an edge, and E2, a top view of it. L being the shaft, on which the racks turn, and N, N, the grooves into which screws are placed to keep the frame in its place, and also allows it to move as it should.

Fig. 7, is the main bolt in detail, A being a front; A', a top; A2, a back; A3,a bottom View of it; a., being that part which enters the stop-bolt B, at b; c, the place where the flange of the handle G, turns to move the bolt, and f the place where the lower end of the lever F, goes.

Fig. 8 shows the lever in detail, F, being a front, and F, a top edge view of it.

Fig. 9, is the handleG, being a section lengthwise through it, and G', a cross-section through the flange.

Fig. 10, shows that part of the body of the lock, which goes through the door, l, Z, being the washer that moves on it, lto fit doors of different thicknesses. A cross section through T, is shown at AV V V V Figs. 3 and 4.

Fig. 11, is a View of one of the rack and pinion guards, D, being a side View of the rack (as seen in Figs. 3 and 4) C, the same view of the pinion, and D, a cross-section through the body of the rack D; S, being a spiral spring which keeps the rack back against the frame E, and throws it back, when it has been moved by the plunger P, (Fig. 4), as soon as the plunger is removed; is a deep notch or space between two of the teeth of the pinion, into which a part of the stop bolt B, is forced when the lock is unlocked; the racks and pinions move on the shafts L, and J.

Fig. 12, shows the key.

The same letters indicate like parts in all of the figures.

I will now describe the construction and manner of changing the combination of the keeps it shut; P P P P P P are plungers which move the rack and pinion guards, and they are forced into the orifices T, T, T, T, T, T, (Fig. 10) when the lock is to be locked or unlocked. K (Fig. 12) is also a top view of the key, when the lid is open, with three of the plungers taken out, so as to show how they are kept in their places when in.

P, P2, are edge views of the plungers, which are constructed with ten not-ches (more or less as the lock is made), as shown at P, P, P, in K, and are made to agree with the inside of the lock. The plungers "are placed in the grooves (Zd, (Zd, (Zd of the case K', the notches marked 0, 1, 2, 3, 4, 5, 6, 7, 8 and 9 being on the edge n, n, n, of the case as desired; in K the plungers are placed P, at 3 P, at 4 P, at 2, P, at 5, P, at 2, and P, at l, reading along the edge y, y, y, y, y, y, 342521, that being the number to which the lock is to be locked (or unlocked if that is the number to which it is locked) when the key is set as shown at K; at K the three plungers P, P, P, are all set at 4.

K2 is an edge view of the key, showing that end of the plungers which enter the lock, the lid being open as shown at m; e, being the clasp. By placing all of the plungers so that 0 will be on the edge y, y, y, y, y, y, it will read 000000; then if P, only be advanced, so that the figures 1, 2, 3,4, 5, 6, 7, 8 and 9, will be on the edge in succession, it will read 000001, 000002, 000003, 000004, 000005, 000006, 000007, 000008, 000009; then by setting P, at 1, and going through the same changes with P, it will read all the numbers from 000010 to 000019, and then by advancing P, to 2, 3, 4, 5, 6, 7, 8 and 9, in succession and going through with all the changes as before with P, it will read all of the numbers up to 000099; then if P, be placed at 1 and the same changes as before be made with P, and P, it will read up to 000199, and so on until all of the plungers have been placed at 9, and then it will read 999999.

In Figs. 1, 2, &c., A, is the main bolt; B, the stop-bolt; C, C, C, C, C, C, the siX pinions; D D, D, D, D, D, the siX racks; E, the frame that holds the racks; F, the lever that forces the frame up and down when the racks are thrown into or out of gear; Gr, is the handle which throws the bolts A, andB; H, is the cross-piece that holds the handle G, in its place when the cap is taken off; I, I, are parts of the body of the lock that hold the shaft J, J, in its place, and also help to keep the bolt A, in its place; J, J, the shaft on which the pinions turn; L, L, the shaft on which the racks turn; M, M, are the screws that hold the lock on to the door; N, N, the screws that hold the frame E, in its place; O, is the screw or pin which'fastens the lever F, on to the body of the lock; Q, is the pin of the frame E, on which the lever F, works when the racks are thrown into or out of gear; R, R, are parts of the Vbody of the lock which keep the bolts A, and

B, in their respective places; S, S, S, S, S, S, are the springs that keep the racks in their places; T, is the arm of the rack D, andl V, V, the body of the lock. When the lock is to be locked, the key is set at some number, and then the plungers are forced into the orifices T T T T T T Fig. 10, and as they press against the arms T, Figs. 3 and 4, the racks will be forced back, and as the handle G, is turned the main-bolt A, will be forced from the position shown in Fig. 1, to that shown by the dot-ted lines in Fig. 2. As the main bolt A, is forced along it will carry the lower end of the lever F, along with it,I and that will bring down the rack frame E,

and force the racks into gear with the pinions, and hold them there, and as that part of the main-bolt A, marked is out of the stop-bolt B, the bolt B, can be forced down by the flange of the handle G, and as soon as the plungers are taken out the spring S, of the racks will force the racks back again against the frame E, carrying with them the pinions, and the notch X, will not be over that part of the set bolt B, which enters them when the lock is unlocked. If one of the plungers be changed only one notch and the key be again forced into the lock, the rack on Vwhich that plunger acts will not be forced to the same place that it was when the lock was locked and the pinion will not be turned as far, and the deep notch K, will not be over the stop-bolt B, and that cannot be forced up; for instance, if the rack, of which Fig. 4 is a section, had been locked, as shown in Fig. 4, so that the tooth marked 5 came in the space marked O, and the key taken out, the rack and pinion would be in the position shown in Fig. 11. Now if the key be changed to 4 and forced into the lock, the rack will not be forced back as far as it was when it was locked and the stop-bolt B, would enter the space next to the deep notch a, and of course could not be forced up to its place; but if the plunger be changed back to 5, the notch x, will be directly over the bolt B, and that can be forced up to its place and the main bolt can be forced back carrying along the lever F, and throwing the rack out of gear again and the lock will be ready for the same or another combination (or number). By moving the plunger after t-he lock is locked it will be a mental lock, as no one but the one that locked it will know to what number it is locked, and with the key there would-be but one chance in a million of unlocking it. By using another rack and pinion the key would have a combination of, ten million-each rack and pinion adding ten fold to the combination of the key, when ten teeth only are used on the racks; by using more teeth the combination would increase in a greater ratio( The general form and arrangement of the plungers P (of the key) as described, so that all of the changes can be made in the key, thereby making it a mental lock or not as wished; together with the general form and arrangement of the bolts A and B, the rack and pinions D and C, with the frame and lever E and F in the manner described, so that the lock will accommodate itself to the key.

1NM. H. GREENWOOD. Witnesses Y Y JNO. C. STEWART, JOHN MCFARLAND. 

